Method of casting chilled valve-seats.



B. BOYKIN, JR. METHOD OF CASTING CHILLED VALVE SEATS. APPLICATION FILEDDEC- I6, 19l8.

1,296,751., Patented Mar. 11, 1919.

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BURELL BOYIN, JR, F BEAUMON'E,'TEXAS.

til; THOD 0F CASTING CHIL VALVE-SEATS.

s ecification of Letters Patent.

Patented Mar. it, 1919.

Application filed December 18, 1913. Serial No. 267,014.

To all whom it may concern:

Be it known that I, BURWELL Bo 2:. N, J12, a citizen of the UnitedStates, residing at Beaumont, in the county of Jefierson and State ofTexas, have invented a new and useful Method of Casting ChilledValve-Seats. of which the following is 'a specification.

This invention relates to valve seats and to a method of casting thesame, one of its objects being to provide a one-piece seat the activeface of which is hardened by chilling during the casting operation,thereby to increase its wearing qualities.

A further object is to provide means whereby, when the molten metal ispoured into the mold, a' portion thereof will be chilled, the chillingmeans being retained in the mold for use in successive casting operations.

With the foregoing and other objects in view which will appear as thedescription proceeds,

the invention consists of certain novel features and in the novel stepsin the method of making the seats, as will be hereinafter more fullydescribed and claimed, it being understood that various changes may bemade in the apparatus used and in the method pursued, Without departingfrom the spirit or sacrificing any of the advantages of the invention asset forth in the appended claim.

In the accompanying drawings the preferred form of the invention and theapparatus used in carrying out the method have been shown.

In said drawings Figure 1 is a plan view of the drag of the mold withthe chills therein.

Fig. 2 is a bottom plan view of the cope.

Fig. 3 is a vertical section through the assembled mold ready to receivethe molten metal.

Referring to the figures by characters of reference, 1 designates thedrag filled with sand, as ordinarily. Embedded in the sand 2, at desiredpoints, are chills 3 which can be circular plates, as shown, the upperfaces of the chills, if desired,-being raised slightly above the surfaceof the sand 2. Patterns, not shown, are adapted to be placed on thechills, after which sand is placed in the cope 4 and thoroughly packed.The cope is lifted, the patterns removed, and the cope replaced on thedrag. Molten metal is then poured into the gate 5 and will bedistributed to the various runways 6 and the blanks 7, completelyfilling them. The hot metal comes into contact with the chills beforethe blanks are filled and when the operation,is conipleted, the cope isremoved, the cast articles lifted from the mold, and the foregoingoperation repeated. It is to be understood that the chills are notremoved from the mold. A valve seat, such as produced in the man nerdescribed is formed with a hardened Wear portion, as shown at 8'in Fig.4 and will be superior to seats made in the usual manner. J

What is claimed.is:

The'hereindescribed method of producing valve seats which consists inembedding a chill plate in the sand of a drag with its face expdsed,placing a pattern on. the chill plate, packing sand in a cope and aboutthe pattern, removing the pattern to form a blank closed at the bottomby the chill plate, and supplying molten metal to the blank.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

BURWELL BOYKIN, JR.

Witnesses:

'lnos. F. Nnnson, E. L. BOYKIN.

